The largest drainless mountain lake of Central Asia is the Koko Nor (also known as Qinghai Hu), a salt lake. It is situated in a depression in the Qilian Mountains of Qinghai province, in west-central China, and its surface is at an altitude of some 10,500 feet (3,200 meters). The lake once drained into the Machu River, but long ago the uplift of the surrounding mountains cut off this outlet.

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